This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / powerpc / platforms / 52xx / mpc52xx_common.c

diff --git a/arch/powerpc/platforms/52xx/mpc52xx_common.c b/arch/powerpc/platforms/52xx/mpc52xx_common.c
new file mode 100644 (file)
index 0000000..cc40889
--- /dev/null
+++ b/arch/powerpc/platforms/52xx/mpc52xx_common.c
@@ -0,0 +1,127 @@
+/*
+ *
+ * Utility functions for the Freescale MPC52xx.
+ *
+ * Copyright (C) 2006 Sylvain Munaut <tnt@246tNt.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/kernel.h>
+
+#include <asm/io.h>
+#include <asm/prom.h>
+#include <asm/of_platform.h>
+#include <asm/mpc52xx.h>
+
+
+void __iomem *
+mpc52xx_find_and_map(const char *compatible)
+{
+       struct device_node *ofn;
+       const u32 *regaddr_p;
+       u64 regaddr64, size64;
+
+       ofn = of_find_compatible_node(NULL, NULL, compatible);
+       if (!ofn)
+               return NULL;
+
+       regaddr_p = of_get_address(ofn, 0, &size64, NULL);
+       if (!regaddr_p) {
+               of_node_put(ofn);
+               return NULL;
+       }
+
+       regaddr64 = of_translate_address(ofn, regaddr_p);
+
+       of_node_put(ofn);
+
+       return ioremap((u32)regaddr64, (u32)size64);
+}
+EXPORT_SYMBOL(mpc52xx_find_and_map);
+
+
+/**
+ *     mpc52xx_find_ipb_freq - Find the IPB bus frequency for a device
+ *     @node:  device node
+ *
+ *     Returns IPB bus frequency, or 0 if the bus frequency cannot be found.
+ */
+unsigned int
+mpc52xx_find_ipb_freq(struct device_node *node)
+{
+       struct device_node *np;
+       const unsigned int *p_ipb_freq = NULL;
+
+       of_node_get(node);
+       while (node) {
+               p_ipb_freq = get_property(node, "bus-frequency", NULL);
+               if (p_ipb_freq)
+                       break;
+
+               np = of_get_parent(node);
+               of_node_put(node);
+               node = np;
+       }
+       if (node)
+               of_node_put(node);
+
+       return p_ipb_freq ? *p_ipb_freq : 0;
+}
+EXPORT_SYMBOL(mpc52xx_find_ipb_freq);
+
+
+void __init
+mpc52xx_setup_cpu(void)
+{
+       struct mpc52xx_cdm  __iomem *cdm;
+       struct mpc52xx_xlb  __iomem *xlb;
+
+       /* Map zones */
+       cdm = mpc52xx_find_and_map("mpc52xx-cdm");
+       xlb = mpc52xx_find_and_map("mpc52xx-xlb");
+
+       if (!cdm || !xlb) {
+               printk(KERN_ERR __FILE__ ": "
+                       "Error while mapping CDM/XLB during mpc52xx_setup_cpu. "
+                       "Expect some abnormal behavior\n");
+               goto unmap_regs;
+       }
+
+       /* Use internal 48 Mhz */
+       out_8(&cdm->ext_48mhz_en, 0x00);
+       out_8(&cdm->fd_enable, 0x01);
+       if (in_be32(&cdm->rstcfg) & 0x40)       /* Assumes 33Mhz clock */
+               out_be16(&cdm->fd_counters, 0x0001);
+       else
+               out_be16(&cdm->fd_counters, 0x5555);
+
+       /* Configure the XLB Arbiter priorities */
+       out_be32(&xlb->master_pri_enable, 0xff);
+       out_be32(&xlb->master_priority, 0x11111111);
+
+       /* Disable XLB pipelining */
+       /* (cfr errate 292. We could do this only just before ATA PIO
+           transaction and re-enable it afterwards ...) */
+       out_be32(&xlb->config, in_be32(&xlb->config) | MPC52xx_XLB_CFG_PLDIS);
+
+       /* Unmap zones */
+unmap_regs:
+       if (cdm) iounmap(cdm);
+       if (xlb) iounmap(xlb);
+}
+
+void __init
+mpc52xx_declare_of_platform_devices(void)
+{
+       /* Find every child of the SOC node and add it to of_platform */
+       if (of_platform_bus_probe(NULL, NULL, NULL))
+               printk(KERN_ERR __FILE__ ": "
+                       "Error while probing of_platform bus\n");
+}
+